Guard mounting for jointer cutters



Sept. 23, 1952 w. B. BOICE GUARD MOUNTING FOR JOINTER CUTTERS 2 suEE'rs-sm'r 1 Filed Dec. 50, 1950 INVENTOR: I V/Z/mm 5. 50/02 A TTORN: Y

W. B. BOICE GUARD MOUNTING FOR JOINTER CUTTERS Sept. 23, 1952 Filed Dec. 30. 1950 2 Sl-lEETS-SHEET 2 INVENTOR. VV/W/am 5. 50/66 Arranwe v Patented Sept. 23,: 1952 dunno MOUNTING roe JoiN'rEa ou'r'rsas William B. Boice, Toledo, Ohio, assignor to Boice- Crane Company,- Toledo, Ohio, a corporation of Ohio a licatio December 30, 195e, Serial No. 203,596

2 Claims. 1 a

This invention relates to woodworking machines but more particularly to knife guards for jointers or the like, which serve as a safety feature to protect the operator from injury during the operation of the machine.

It is a desideratum to provide machines of this character with a j'ointer guard, which is efficient and satisfactory for the purpose intended but which can be readily and conveniently moved out of the way when desired without the necessity of disconnecting it from the machine, the guard being thus disposed in an out of the way position but conveniently located so that'it can be almost instantaneously returned to'its operative protective position. j

An object is to produce anew and improved jointer guard mounting, which is not only inexpensive to manufacture and assemble but can be almost instantaneously moved to and from opera tive position andwhen in inoperative'position likewise is positioned alongside of the machine occupying a minimum amountofspace without interfering with the free and unrestricted use of the machine for rabbeting and other purposes.

Other objects and advantages of the invention will hereinafter appear and for purposes of illus tration but not of limitation, an embodiment of the invention is shown in the accompanying drawings in which Figure '1 is a front perspective view of a jointer showingthe knife guard in position of use in full lines and showing it in its inoperative or out of the way position by broken lines;

Figure 2 is an enlarged top plan view of the Figure 3 is a side elevation of the guard and associated work table fragment;

Figure 4 is a sectional view on the line 4-4 of Figure 2 ShOWing the pivotal connection between the guard plate and the arm;

Figure 5 is a fragmentary end elevation of the hingedly connected members, and showing a portion of the guard plate and the win nut for securing the shouldered end of the guard carrying arm; and s Figure 6 is a fragmentary plan View of the guard in its inoperative position.

The illustrated embodiment of the invention comprises a jointer which has a cabinet base or standard it, which elevates the jointer bed I! having a flat table top l2. Adjustable on the bed H is a base 13a having a table I3 provided with longitudinal extension 32). The base [312 is adjustable vertically relative to the. t le W by the 2 operation of hand wheel I 3 as will be readily understood by those skilled in this art.

Shiftable transversely of the table tops and adjustable angularly is a fence 15, which can be secured in adjusted position by suitable fastening elements It. A rotary cutter ll extends transversely of the inner end portion of the table it and maybe driven by an electric motor (not shown) arranged within the cabinet base M.

For guarding the cutter H is a substantially flat metallic plate l8 generally triangular in shape which is pivotally connected to one endof a rod arm [9 so as to move relatively thereto transversely across the table top. As shown,'one apex of the plate 18 has a depending boss Zilfwhich fits into a cup-shaped member 2| and a shouldered screw 22 provides a bearing about which the plate can rock. The guard plate hasa depending hub-like portionzila which bears against and rocks upon the flat top of the cup.' The bottom oft-he cup 2| rests upon the top of the table l3.. r I I Disposed in a cavity in the cup member 2! ts a torsional spring 23, opposite ends of which are secured to the hub 213a and cup 2!, the arrangement being such that the guard plate 18 is nor mally resiliently urged in a direction toward the fence #5, thereby to bear against thefence or a wooden workpiece resting alongside the fence, as will be readily understood. The cup 2| has an opening on one side to receive the rod or guard arm 19, the end of which is in screwthreaded engagement with the opening. Y The rod arm 19 extends at right angles to the axis'of the guard plate l8 and in parallel relation slightly above the table [3. As shown, the rod arm extends a short distance beyond the end of the table extension Hi). The outer end portion of the guard arm 19 is shouldered to provide a reduced screw-threaded end 24 which extends freely through an aperture formed in an upright hinge member 25, the upper end of which is offset outwardly as indicated on Figure 5. On the outer end of the screw-threaded end portion 24 is a wing nut 26, which when loosened, enables the guard arm I9 to be turned or rocked as will hereinafter appear. The lower end of the hinge member 25 fits a yoke-like bracket 2?, which is rigidly secured against a wall portion I 30, rigid with the under side of the table extension I3b by a bolt and nut assembly 23. A pin 29 pivotally or hingedly connects the bracket member 21 and hinge member 25 providing an axis for the hinge member 25 at right angles to the axis of the guard plate 18.

When the guard plate I 8 is in its useful or operative position, it is disposed in the position shown by full lines on Figure 1 with the hinge member 25 upstanding, the torsion spring 23 resiliently urging the guard plate toward the fence l5. When it is desired to use the jointer for rabbeting purposes, for example, the guard plate [8 and its arm [9 are swung in a counterclockwise direction (Figure 1) about the hinge pin 29, and then by loosening the wing nut 26, the arm [9 can be turned sufficiently so that the guard plate can assume a depending position alongside of the bed H below the table top 12 and in inwardly spaced relation to the outer edge portion of the table extension I3b. In this position, the guard plate is out of the Way and in a position, which does not interfere with the full and unrestricted use of the table tops and the rotary cutter l1. Thus the hinged bracket arm 25 swings from its uppermost position such as shown on Figure 3 to a depending position abutting against the wall portion I30, thus supporting the guard plate in the desired position out of use and away from the operator. The guard plate l8 has a depending flange I8a, which spaces the plate a sufficient distance above the table l3 'to clear the rotary cutter. This flange acts as a stop and engages the guard arm [9 when in inoperative position to retain the guard plate in the broken line position of Figure 1. Manifestly by reversing the above operation, the guard plate can be reinstalled quickly and conveniently in position of use.

The above structure can be inexpensively manufactured and assembled, the number of parts being reduced to a minimum. An important advantage resides in maintaining the guard plate connected to the machin at all times either in operative or inoperative position so that it is not mislaid or damaged but is at all times conveniently accessible for return movement to its operative position.

It is to be understood that numerous changes in details of construction, arrangement and operation may be effected without departing from the spirit of the invention especially as defined in the appended claims.

What I claim is: I

1. In a jointer, an elongate table having contiguous relatively wide and narrow longitudinal portions, the relatively wide portion extending laterally from the narrow portion and having an inwardly extending shoulder at the end thereof adjacent the narrow portion, whereby said shoulder and the adjacent edge of the narrow portion define two sides of a pocket along one side of the table for part of the length thereof; a knife mechanism mounted in the wide portion of the table; a knife guard; and a support for said knife guard mounted on said table, said support comprising a horizontal pivot afilxed to said shoulder and extending transverse of the length of the table; an extension arm having one end swingably supported by said pivot; and a rotatable connection between the other end of said arm and said guard, the guard and support therefor being shorter in their maximum total dimensions, than said pocket whereby said guard and arm may be swung about said pivot between a working position adjacent said knife to a retracted position in which said guard rests entirely with said Pocket.

2. In a jointer, an elongate table having contiguous relatively wide and narrow longitudinal portions, the relatively wide portion extending laterally from the narrow portion and having an inwardly extending shoulder at the end thereof adjacent the narrow portions, whereby said shoulder and the adjacent edge of the narrow portion define two sides of a pocket along one side of the table for part of the length thereof; a knife mechanism mounted in the wide portion of the table; a knife guard; and a pivotal support for said knife guard mounted on said shoulder, said support comprising a first bracket aifixed to said shoulder, a pivot pin carried by said bracket and extending transversely of the length of said table, a second bracket having an ear pivotally supported on said pivot pin and a socket extending transversely of said pivot pin; an extension arm having one end rotatably supported in said socket; and a rotatable connection between the other end of said arm and said guard, whereby said guard and arm may be swung about said support between a working position adjacent said knife to a retracted position in which said guard rests in said pocket.

WILLIAM B. BOICE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 528,262 Shields Oct. 30, 1894 882,252 Knuth Mar. 17, 1908 1,126,970 Folmer Feb. 2, 1915 1,375,013 Pinette Apr. 19, 1921 1,829,827 Garbarino Nov. 3, 1931 2,054,518 Ocenasek Sept. 15, 1936 

